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fix difference calc and add tests (#9950)
Fixes a whoopsie in the difference function and adds tests at the same time.
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@ -0,0 +1,15 @@
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import { difference, union } from './set-functions';
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test('union', () => {
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const a = [1, 2];
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const b = new Set([2, 3]);
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const c = union(a, b);
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expect([...c]).toEqual([1, 2, 3]);
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});
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test('difference', () => {
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const a = [1, 2];
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const b = new Set([2, 3]);
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const c = difference(a, b);
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expect([...c]).toEqual([1]);
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});
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@ -6,7 +6,7 @@
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// todo: replace the use of this methods with set.union and set.difference when
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// it's available.
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export const union = <T>(a: Iterable<T>, b: Set<T>) => {
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export const union = <T>(a: Iterable<T>, b: Set<T>): Set<T> => {
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const result = new Set(a);
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for (const element of b) {
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result.add(element);
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@ -14,8 +14,8 @@ export const union = <T>(a: Iterable<T>, b: Set<T>) => {
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return result;
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};
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export const difference = <T>(a: Iterable<T>, b: Set<T>) => {
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const result = new Set(a);
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export const difference = <T>(a: Iterable<T>, b: Set<T>): Set<T> => {
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const result = new Set<T>();
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for (const element of a) {
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if (!b.has(element)) {
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result.add(element);
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